autoflight
The engines initially responded
but, at a height of about 720 ft, the thrust of the right engine
reduced. Some seven seconds later, the thrust reduced on
the left engine to a similar level. The engines did not shut
down and both engines continued to produce thrust at an
engine speed above flight idle, but less than the commanded
thrust. The engines failed to respond to further demands
for increased thrust from the autothrottles, and subsequent
movement of the thrust levers fully forward by the flight
crew
it's in the report.